import java.math.BigInteger;
import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 刘柄华
 * Date: 2022-05-24
 * Time: 22:41
 */
public class TestDemo02 {

    /*
    * 不使用四则运算  求两个数的和
    * */
    public int Add(int num1,int num2){

        while(num2!=0){
            int up = (num1&num2)<<1;
            num1 = num1^num2;
            num2 = up;
        }
        return num1;
    }


    /*
    * 判断是否是三角形
    * */
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            BigInteger a=sc.nextBigInteger();
            BigInteger b=sc.nextBigInteger();
            BigInteger c=sc.nextBigInteger();
            if(a.add(b).compareTo(c)>0 && a.add(c).compareTo(b)>0 && b.add(c).compareTo(a)>0)
                System.out.println("Yes");
            else
                System.out.println("No");
        }
    }
}
